Demonstration device



FIG. 1 is a top, front and right side perspective view of ademonstration device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view thereof; and

FIG. 7 is an exploded top, front and right side perspective viewthereof.

The ornamental design for a demonstration device, as shown anddescribed.